예제 #1
0
static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
{
    SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
    SCSIDevice *s = r->req.dev;
    int ret;

    DPRINTF("Command: lun=%d tag=0x%x len %zd data=0x%02x", lun, tag,
            r->req.cmd.xfer, cmd[0]);

#ifdef DEBUG_SCSI
    {
        int i;
        for (i = 1; i < r->req.cmd.len; i++) {
            printf(" 0x%02x", cmd[i]);
        }
        printf("\n");
    }
#endif

    if (r->req.cmd.xfer == 0) {
        if (r->buf != NULL)
            g_free(r->buf);
        r->buflen = 0;
        r->buf = NULL;
        /* The request is used as the AIO opaque value, so add a ref.  */
        scsi_req_ref(&r->req);
        ret = execute_command(s->conf.bs, r, SG_DXFER_NONE, scsi_command_complete);
        if (ret < 0) {
            scsi_command_complete(r, ret);
            return 0;
        }
        return 0;
    }

    if (r->buflen != r->req.cmd.xfer) {
        if (r->buf != NULL)
            g_free(r->buf);
        r->buf = g_malloc(r->req.cmd.xfer);
        r->buflen = r->req.cmd.xfer;
    }

    memset(r->buf, 0, r->buflen);
    r->len = r->req.cmd.xfer;
    if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
        r->len = 0;
        return -r->req.cmd.xfer;
    } else {
        return r->req.cmd.xfer;
    }
}
예제 #2
0
/* Write data to a scsi device.  Returns nonzero on failure.
   The transfer may complete asynchronously.  */
static void scsi_write_data(SCSIRequest *req)
{
    SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
    SCSIDevice *s = r->req.dev;
    int ret;

    DPRINTF("scsi_write_data 0x%x\n", req->tag);
    if (r->len == 0) {
        r->len = r->buflen;
        scsi_req_data(&r->req, r->len);
        return;
    }

    /* The request is used as the AIO opaque value, so add a ref.  */
    scsi_req_ref(&r->req);
    ret = execute_command(s->conf.blk, r, SG_DXFER_TO_DEV, scsi_write_complete);
    if (ret < 0) {
        scsi_command_complete(r, ret);
    }
}
예제 #3
0
파일: scsi-generic.c 프로젝트: iazhuo/qemu
/* Read more data from scsi device into buffer.  */
static void scsi_read_data(SCSIRequest *req)
{
    SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
    SCSIDevice *s = r->req.dev;
    int ret;

    DPRINTF("scsi_read_data tag=0x%x\n", req->tag);

    /* The request is used as the AIO opaque value, so add a ref.  */
    scsi_req_ref(&r->req);
    if (r->len == -1) {
        scsi_command_complete_noio(r, 0);
        return;
    }

    ret = execute_command(s->conf.blk, r, SG_DXFER_FROM_DEV,
                          scsi_read_complete);
    if (ret < 0) {
        scsi_command_complete_noio(r, ret);
    }
}